Abstract
Abstract The oxidation of divalent metal tetraphenylporphin complexes by molecular oxygen has been investigated in solutions. It was found that the one-electron oxidation of low-spin iron(II) complexes to yield high-spin iron(III) does not take place, while a low-to-low conversion proceeds with ease. It is suggested that the ready oxidation is due to the delocalization of the dπ electrons of iron(II) to the vacant π-orbital of the porphin ligand. Oxidative mechanisms of manganese(II) and cobalt(II) tetraphenylporphins were also discussed.
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